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Exploring Light and Quantized Energy in Chemistry

Understand the connection between an element's chemical behavior and electron arrangement, which are linked to light energy. Dive into the electromagnetic spectrum and the properties of waves, including wavelength, amplitude, frequency, and the speed of light. Explore the particle and wave nature of light, with insights from figures like Max Planck and Albert Einstein. Discover atomic emission spectra and their importance in identifying elements. Real-life applications of these concepts range from fireworks to solar panels, showing the practical relevance of studying light and energy in chemistry.

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Exploring Light and Quantized Energy in Chemistry

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  1. ChemistryChapter 5 Ch5 Notes #1

  2. Light and Quantized Energy • An element’s chemical behavior is connected to electron arrangement • Electron arrangement and chemical properties are connected to light energy • Form of energy that exhibits wave- like behavior…. • Ex. Visible light, x-rays, microwaves, etc…. • EM Spectrum – all electromagnetic radiation

  3. Waves • Described by: • Wavelength: Shortest distance between 2 equivalent points on a continuous wave • Amplitude: height from origin to crest • Frequency: how many complete waves pass a point in a given amount of time • Hertz; waves per second • Speed of light (c)- wavelength x speed • 3.00 x 108 m/s

  4. Waves - review

  5. Light – Wave or particle? • Max Planck • Quantum – minimum amount of energy that can be gained or lost by an atom… • Albert Einstein (1905) • Completion of the particle model • EM radiation = stream of tiny particles (bundles of energy) that move like a wave – called photons • Photon = a particle of EM radiation with no mass that carries a quantum of energy

  6. Light – Wave or particle? • EM radiation – wave and particle like!! Increasing Energy

  7. Atomic Emission Spectra • Set of frequencies of the electromagnetic waves emitted by atoms of an element • Each element gives off a unique set of frequencies • Quantum Mechanics • Electrons emit certain energy (related to wavelength) • Each spectra consists of several “lines” of color…not a continuous range like a visible spectra (rainbow) – there are “black” spaces in between the colors.

  8. Example

  9. Real Life Uses • Fireworks • Neon Signs • Bon-Fire (Old Christmas lights) • Rainbows • Scientists can learn what stars are made of by observing the spectrum they emit • Photoelectric panels (solar houses, calculators)

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